计入热效应的曲轴主轴承润滑性能影响因素分析

Analysis of Factors Affecting Lubrication Performance of Crankshaft Main Bearing Considering Thermal Effect

针对曲轴主轴承润滑性能的影响因素,建立计入热效应的主轴承弹性流体动力润滑模型,模型将轴承外部载荷、轴承间隙和进油温度作为变量,分析了主轴承在不同变量下的最大油膜压力、最小油膜厚度、最高轴承温度和最大摩擦功率损失。结果表明,计入热效应对曲轴主轴承有较大影响,当轴承外部载荷增大时,轴承的最大油膜压力、最小油膜厚度和最大摩擦功率损失均会增大;当轴承间隙变小时,轴承的最大油膜压力减小,轴承温度升高;当进油温度增加,轴承最大油膜压力增大、最小油膜厚度减小、最大摩擦功率损失减小。

In view of the factors affecting the lubrication performance of crankshaft main bearing, an elastohydrodynamic lubrication model of crankshaft main bearing, considering thermal effect, is established. The model takes the external load of bearing, bearing clearance and oil inlet temperature as variables to analyze the maximum oil film pressure, minimum oil film thickness, maximum bearing temperature and maximum friction power loss under different variables. The calculation results show that the thermal effect has a great influence on the crankshaft main bearing. When the external load of the bearing increases, the maximum oil film pressure,minimum oil film thickness and maximum friction power loss will increase;when the bearing clearance becomes smaller, the maximum oil film pressure decreases and the bearing temperature increases;when the oil inlet temperature increases, the maximum oil film pressure increases, the minimum oil film thickness decreases and the maximum friction power loss decreases.